21111765271 has 2 divisors, whose sum is σ = 21111765272. Its totient is φ = 21111765270.

The previous prime is 21111765263. The next prime is 21111765307. The reversal of 21111765271 is 17256711112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111765271 - 2³ = 21111765263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111765221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555882635 + 10555882636.

It is an arithmetic number, because the mean of its divisors is an integer number (10555882636).

Almost surely, 2^21111765271 is an apocalyptic number.

21111765271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111765271 is an equidigital number, since it uses as much as digits as its factorization.

21111765271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 34.

The spelling of 21111765271 in words is "twenty-one billion, one hundred eleven million, seven hundred sixty-five thousand, two hundred seventy-one".